To make an inexpensive and useful water stain Van Dyck Crystals are dissolved in HOT water (not boiling) to obtain colours from dark brown to a light tan. The quantity of crystals can be varied to obtain the desired colour; or make a strong stock solution, then dilute a portion with hot water for lighter tones.To assure even results strain through muslin or clean cotton cloth to eliminate any possible sediment.
(The addition of a tablespoon of Technical Ammonium Hydroxide to a quart of solution will increase the penetration into the wood and slightly darken the colour. Keep the ammonia off your hands and avoid breathing the fumes.)(Use water soluble aniline dye in mixed liquid form to enhance or tone towards warm or cool colours.)

Van Dyck (Vandyke) Crystals, Genuine Walnut Crystals•• Yield shades of Brown from a Light Straw to Deep Brown.This traditional old-world dye is used to patinate or tone light colored woods and enhance rich tones of walnut and other dark toned timber.
Use on furniture, timber framng, woodwork, and small craft to achieve a natural aged look.An inexpensive and useful water Dye stain.(not an aniline but, Very Useful for intermixing with water based aniline dyes)